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Updated README
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# ROCm OpenSHMEM (rocSHMEM)
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The ROCm OpenSHMEM (rocSHMEM) runtime is part of an AMD Research
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initiative to provide a unified runtime for heterogeneous systems.
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rocSHMEM supports both host-centric (a traditional host-driven
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OpenSHMEM runtime) and GPU-centric networking (provided a GPU kernel
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the ability to perform network operations) through an
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OpenSHMEM-like interface. This intra-kernel networking simplifies application
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The ROCm OpenSHMEM (rocSHMEM) runtime is part of an AMD and AMD Research
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initiative to provide GPU-centric networking through an OpenSHMEM-like interface.
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This intra-kernel networking library simplifies application
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code complexity and enables more fine-grained communication/computation
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overlap than traditional host-driven networking.
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rocSHMEM uses a single symmetric heap (SHEAP) that is allocated on GPU memories.
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rocSHMEM's primary target is heterogeneous computing; hence, for both
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CPU-centric and GPU-centric communications, rocSHMEM uses a single
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symmetric heap (SHEAP) that is allocated on GPU memories.
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There are currently three backends for rocSHMEM;
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IPC, Reverse Offload (RO), and GPU-IB.
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The backends primarily differ in their implementations of intra-kernel networking.
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Currently, only the IPC backend is supported.
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The RO and GPU-IB backends are provided as-is with
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no guarantees of support from AMD or AMD Research.
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rocSHMEM's GPU-centric communication has two different backend designs.
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The backends primarily differ in their implementations of
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intra-kernel networking.
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The IPC backend implements communication primitives using load/store operations issued from the GPU.
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The first design will be referred to as the the GPU InfiniBand (GPU-IB)
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backend. This backend implements a lightweight InfiniBand verbs interface
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on the GPU. The GPU itself is responsible with building commands and ringing
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the doorbell on the NIC to send network commands. GPU-IB is the default and
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preferred backend design that offers the best performance.
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The second design will be referred to as the Reverse Offload (RO) backend. With
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the RO backend, the GPU runtime forwards rocSHMEM networking operations to the
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host-side runtime, which calls into a traditional MPI or OpenSHMEM
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implementation. This forwarding of requests is transparent to the
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The Reverse Offload (RO) backend has the GPU runtime forward rocSHMEM networking operations
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to the host-side runtime, which calls into a traditional MPI or OpenSHMEM
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implementation. This forwarding of requests is transparent to the
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programmer, who only sees the GPU-side interface.
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Both designs of the GPU-centric interface coexist seamlessly with the
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CPU-centric interface of the unified runtime. rocSHMEM ensures that CPU-centric
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updates to the SHEAP are consistent and visible to a GPU kernel that is executing
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in parallel to host-initiated communication.
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The GPU InfiniBand (GPU-IB) backend implements a lightweight InfiniBand verbs interface
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on the GPU. The GPU itself is responsible for building commands and ringing
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the doorbell on the NIC to send network commands.
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## Limitations
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rocSHMEM is an experimental prototype from AMD Research and not an official
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ROCm product. The software is provided as-is with no guarantees of support
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from AMD or AMD Research.
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## Requirements
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rocSHMEM base requirements:
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* ROCm version 4.3.1 onwards
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* May work with other versions, but not tested
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* AMD GFX9 GPUs (e.g.: MI25, Vega 56, Vega 64, MI50, MI60, MI100, Radeon VII)
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* AMD MI200 GPUs: To enable the support on MI200, please configure the library
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with USE_COHERENT_HEAP
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* ROCm-aware MPI as described in
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* ROCm v6.2.2 onwards
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* May work with other versions, but it has not been tested
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* AMD GPUs
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* MI250X
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* MI300X
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* ROCm-aware Open MPI and UCX as described in
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[Building the Dependencies](#building-the-dependencies)
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* InfiniBand adaptor compatable with ROCm RDMA technology
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* UCX 1.6 or greater with ROCm support
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rocSHMEM optional requirements
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* For Documentation:
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* Doxygen
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rocSHMEM only supports HIP applications. There are no plans to port to
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OpenCL.
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@@ -63,132 +44,125 @@ OpenCL.
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rocSHMEM uses the CMake build system. The CMakeLists file contains
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additional details about library options.
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To create an out-of-source build:
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To create an out-of-source build for the IPC backend:
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mkdir build
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cd build
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```
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mkdir build
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cd build
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../scripts/build_configs/ipc_single
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```
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Next, choose one configuration from the build_configs subdirectory. These
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scripts pass configuration options to CMake to setup canonical builds which
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are regularly tested:
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../scripts/build_configs/dc_single
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../scripts/build_configs/dc_multi
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../scripts/build_configs/rc_single
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../scripts/build_configs/rc_multi
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../scripts/build_configs/rc_multi_wf_coal
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../scripts/build_configs/ro_net_basic
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The build script passes configuration options to CMake to setup canonical builds.
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There are other scripts in `./scripts/build_configs`
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directory but currently, only `ipc_single` is supported.
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By default, the library is installed in `~/rocshmem`. You may provide a
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custom install path by supplying it as an argument. For example:
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../scripts/build_configs/rc_single /path/to/install
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```
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../scripts/build_configs/ipc_single /path/to/install
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```
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## Compiling/linking and Running with rocSHMEM
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## Compiling/Linking and Running with rocSHMEM
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rocSHMEM is built as a host and device side library that can be statically
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linked to your application during compilation using hipcc.
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rocSHMEM is built as a library that can be statically
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linked to your application during compilation using `hipcc`.
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During the compilation of your application, include the rocSHMEM header files
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and the rocSHMEM library when using hipcc:
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-I/path/to/rocshmem/install/include
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-L/path/to/rocshmem/install/lib -lrocshmem
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NOTE: rocSHMEM depends on MPI for its host code. So, you will need to link
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to an MPI library. Since you must use the hipcc compiler, the arguments for
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MPI linkage must be added manually as opposed to using mpicc. Similary,
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rocSHMEM depends on Verbs for its device code. So, you will need to link
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to a Verbs library.
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and the rocSHMEM library when using hipcc.
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Since rocSHMEM depends on MPI you will need to link to an MPI library.
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The arguments for MPI linkage must be added manually
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as opposed to using mpicc.
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When using hipcc directly (as opposed to through a build system), we
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recommend performing the compilation and linking steps separately.
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Here are the steps to build a standalone program, say
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rocshmem_hello.cpp.
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At the top of the examples files (`./examples/*`),
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example compile and link commands are provided:
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```
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# Compile
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/opt/rocm/bin/hipcc ./rocshmem_hello.cpp -I/path/to/rocshmem/install/include -fgpu-rdc -o ./rocshmem_hello.o -c
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hipcc -c -fgpu-rdc -x hip rocshmem_allreduce_test.cc \
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-I/opt/rocm/include \
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-I$ROCSHMEM_INSTALL_DIR/include \
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-I$OPENMPI_UCX_INSTALL_DIR/include/
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# Link
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/opt/rocm/bin/hipcc ./rocshmem_hello.o /path/to/rocshmem/install/lib/librocshmem.a -lmpi -lmlx5 -libverbs -lhsa-runtime64 -fgpu-rdc -o rocshmem_hello
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hipcc -fgpu-rdc --hip-link rocshmem_allreduce_test.o -o rocshmem_allreduce_test \
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$ROCSHMEM_INSTALL_DIR/lib/librocshmem.a \
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$OPENMPI_UCX_INSTALL_DIR/lib/libmpi.so \
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-L/opt/rocm/lib -lamdhip64 -lhsa-runtime64
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```
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If your project uses cmake, please refer to the CMakeLists.txt files
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in the clients directory for examples. You may also find the
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If your project uses cmake,
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you may find the
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[Using CMake with AMD ROCm](https://rocmdocs.amd.com/en/latest/conceptual/cmake-packages.html)
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page useful.
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## Runtime Parameters
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rocSHMEM has the following enviroment variables:
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```
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ROCSHMEM_HEAP_SIZE (default : 1 GB)
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Defines the size of the OpenSHMEM symmetric heap
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Defines the size of the rocSHMEM symmetric heap
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Note the heap is on the GPU memory.
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ROCSHMEM_SQ_SIZE (default 1024)
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Defines the size of the SQ as number of network
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packet (WQE). Each WQE is 64B. This only for
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GPU-IB conduit
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ROCSHMEM_USE_CQ_GPU_MEM (default : 1)
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Set the placement of CQ on GPU memory (1)
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or CPU memory (0)
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ROCSHMEM_USE_SQ_GPU_MEM (default : 1)
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Set the placement of SQ on GPU memory (1)
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or CPU memory (0)
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RO_NET_CPU_QUEUE (default: not set)
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Force producer/consumer queues between CPU and GPU to
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be in CPU memory. RO backend only.
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rocSHMEM also requires the following environment variable be set for ROCm:
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export HSA_FORCE_FINE_GRAIN_PCIE=1
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## Documentation
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To generate doxygen documentation for rocSHMEM's API, run the following
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from the library's build directory:
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make docs
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The doxygen output will be in the `docs` folder of the build directory.
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```
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## Examples
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rocSHMEM is similar to OpenSHMEM and should be familiar to programmers who
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have experience with OpenSHMEM or other PGAS network programming APIs in the
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context of CPUs. The best way to learn how to use rocSHMEM is to read the
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autogenerated doxygen documentation for functions described in
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`rocshmem/rocshmem.hpp`, or to look at the provided sample applications in the
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`tests/` folder. rocSHMEM is shipped with a basic test suite for the
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supported rocSHMEM API. The examples test Puts, Gets, nonblocking Puts,
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nonblocking Gets, Quiets, Atomics, Tests, Wai-untils, Broadcasts, and
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Reductions.
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context of CPUs.
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The best way to learn how to use rocSHMEM is to read the functions described in
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headers in the dirctory `./include/rocshmem/`,
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or to look at the provided example code in the `./example/` directory.
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The examples can be run like so:
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To run the examples, you may use the driver scripts provided in respective
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folders of device- or host-initiated communication examples. Simply
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executing `./driver.sh` will show the help message on how to use the script.
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Here are some example uses of the driver script:
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```
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mpirun -np 2 ./build/examples/rocshmem_getmem_test
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```
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./scripts/functional_tests/driver.sh ./build/rocshmem_example_driver single_thread ./build (for device-initiated communication)
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./scripts/sos_tests/driver.sh ./build short (for host-initiated communication)
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## Tests
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rocSHMEM is shipped with a functional and unit test suite for the supported rocSHMEM API.
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They test Puts, Gets, nonblocking Puts,
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nonblocking Gets, Quiets, Atomics, Tests, Wait-untils, Broadcasts, Reductions, and etc.
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To run the tests, you may use the driver scripts provided in the `./scripts/` directory:
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```
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# Run Functional Tests
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./scripts/functional_tests/driver.sh ./build/tests/functional_tests/rocshmem_example_driver short <log_directory>
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# Run Unit Tests
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./scripts/unit_tests/driver.sh ./build/tests/unit_tests/rocshmem_unit_tests all
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```
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## Building the Dependencies
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rocSHMEM requires an MPI runtime on the host that supports ROCm-Aware MPI.
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Currently all ROCm-Aware MPI runtimes require the usage of ROCm-Aware UCX.
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rocSHMEM requires a ROCm-Aware Open MPI and UCX.
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Other MPI implementations, such as MPICH,
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_should_ be compatible with rocSHMEM but it has not been thoroughly tested.
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To build and configure ROCm-Aware UCX, you need to:
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1. Download the latest UCX
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2. Configure and build UCX with ROCm support: --with-rocm=/opt/rocm
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To build and configure ROCm-Aware UCX (1.17.0 or later), you need to:
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Then, you need to build your MPI (OpenMPI or MPICH CH4) with UCX support.
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```
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git clone https://github.com/openucx/ucx.git -b v1.17.x
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cd ucx
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./autogen.sh
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./configure --prefix=<prefix_dir> --with-rocm=<rocm_path> --enable-mt
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make -j 8
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make -j 8 install
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```
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Then, you need to build Open MPI (5.0.6 or later) with UCX support.
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```
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git clone --recursive https://github.com/ROCm/ompi.git -b v5.0.x
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cd ompi
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./autogen.pl
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./configure --prefix=<prefix_dir> --with-rocm=<rocm_path> --with-ucx=<ucx_path>
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make -j 8
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make -j 8 install
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```
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For more information on OpenMPI-UCX support, please visit:
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https://github.com/openucx/ucx/wiki/OpenMPI-and-OpenSHMEM-installation-with-UCX
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For more information on MPICH-UCX support, please visit:
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https://www.mpich.org/about/news/
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